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Re: Head differences
5.0 Magazine did a flow test of our heads vs others back in their December '04 issue. The FR500 heads are superior to '03/'04 DOHC heads out of the box. But when ported (by the same shop @ Houston Performance), the '03/'04 DOHC heads outflowed the ported FR heads on both intake and exhaust (especially exhaust).
So to answer, our Machs and Cobras share identical heads. And when ported are the best in the business...
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2003 Dark Shadow Gray Mach 1
5.3L Stroker - FR500 Intake - Boss330 Heads
4.56 Gears - Kooks LTs - SCT Tune - Bassani X/Catback
2004 Silver Metallic Cobra
2.3 Whipple - 60lb injectors -Twin FGT Pumps
8 gauge/BAP/FPDM - JLT - Bassani Catted X / Catback - SCT PRP - 4# Lower - 3.50/3.00 Uppers - 19/24 PSI
2017 White Shelby F150
2.9L Whipple
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